I thought it would be interesting to see how other databases handle this peculiar deadlock situation.
I didn't have access to any Oracle or Sybase databases, but for what it's worth I've tested MySQL. Results: 1. Process 1 successfully made its update and managed to commit. 2. Process 1 second update did not went straight through, but had to wait for process 2 to attempt to commit. 3. Process 2 did not manage to commit, all its updates were discarded. Demo of the test: http://screencast.com/t/ZGJmMTcxN /Joel 2010/8/25 Robert Haas <robertmh...@gmail.com>: > On Wed, Aug 25, 2010 at 10:02 AM, Simon Riggs <si...@2ndquadrant.com> wrote: >> On Wed, 2010-08-25 at 15:51 +0200, Markus Wanner wrote: >>> Simon, >>> >>> On 08/25/2010 11:53 AM, Simon Riggs wrote: >>> > ..we want to ensure that the PK value.. >>> >>> ..or any other possibly referenced attributes? >> >> Don't think that's relevant. >> >> "referenced" meaning "by an RI constraint", which only ever refers to >> PKs in other tables. > > That doesn't appear to be correct: > > rhaas=# create table p (a integer primary key, b integer not null, > unique (b)); NOTICE: CREATE TABLE / PRIMARY KEY will create implicit > index "p_pkey" for table "p" > NOTICE: CREATE TABLE / UNIQUE will create implicit index "p_b_key" > for table "p" > CREATE TABLE > rhaas=# create table r (b integer not null references p (b)); > CREATE TABLE > > -- > Robert Haas > EnterpriseDB: http://www.enterprisedb.com > The Enterprise Postgres Company > -- Best regards, Joel Jacobson Glue Finance E: j...@gluefinance.com T: +46 70 360 38 01 Postal address: Glue Finance AB Box 549 114 11 Stockholm Sweden Visiting address: Glue Finance AB Birger Jarlsgatan 14 114 34 Stockholm Sweden -- Sent via pgsql-hackers mailing list (firstname.lastname@example.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers